Volumes have been set forth on this issue, and the conflict and arguments about where the "hot" slot games are installed in a casino are still on-going – sixty years after one armed bandits were 1st placed in gambling houses.
The quintessential rule is that the superior slots were placed just inside the main doorway of the casino; so that fun seekers going by would be able to see actual jackpot winners … be mesmerized enough to come unto the gaming floor … play. Our presumption is that this is no longer the case.
Practically all of the big name casinos nowadays are super-colossal complexes and it is not possible to see inside from the sidewalk, so there’s no longer a reason to have the ‘loose’ slot machines near any doors.
Yet another standard rule is that loose slot machine games are put on the major aisles inside the casinos, again so that more fun seekers could see winning jackpots and be roused to play. However, we find that this also is no longer a universal rule.
What casinos found over the years is that people walking down the busy aisles were frequently on the way to somewhere else. If they played the slots at all, they would simply put in their loose change because they happened to be walking by. Win or lose, they would very often not stop to keep playing. And the last thing a casino wants is for someone to win a jackpot by playing only a few coins and then not stay to put it all back in!
Today, casinos are constantly changing their philosophy about where to place the loose slot machines.